1. The blades in a blender rotate at a rate of 7000rpm. When the motor is turned off during operation, the blades slow to rest in 2.8s.

a. What is the angular acceleration as the blades slow down?

2. A bowling ball of mass 7.20kg and radius 11.0 cm rolls without slipping down a lane at 3.00 m/s

a. Calculate its total kinetic energy.

3. Two masses,mAmA = 33.0 kg and mb= 42.0 kg are connected by a rope that hangs over a pulley (as in the figure below). The pulley is a uniform cylinder of radius R = 0.318 m and mass 3.9 kg . Initially, mA is on the ground and mB rests 2.5 m above the ground.

a. If the system is now released, use conservation of energy to determine the speed ofmB just before it strikes the ground. Assume the pulley is frictionless.

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